Imperator Aleksandr III (Император Александр III) is a Borei-class nuclear-powered ballistic missile submarine of the Russian Navy.

The submarine is named after Alexander III of Russia and was launched on 29 December 2022.

[2][3][4][5] The boat was reported to be nearing the conclusion of its state sea trials as of November 2023.

[6] She entered service on 11 December 2023.

[7]